SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fee9bb2d9edfd4b246745298a851ec741e8d4d99c1c350c436761ef3b5277a01' 
  AND token = 'Dv3YjMe4nx+jkiQ1LIxqC1xBHgVD6IztXIydCbLKzWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}